John M. Slack Jr.

John Mark Slack Jr. (18 March 1915-17 March 1980) was a member of the US House of Representatives (D-WV 6) from 3 January 1959 to 3 January 1963 (succeeding Robert Byrd) and from WV 3 from 3 January 1963 to 17 March 1980 (succeeding Cleveland M. Bailey and preceding John G. Hutchinson).

Biography
John M. Slack Jr. was born in Charleston, West Virginia in 1915, and he became a member of the Kanawha County Court in 1948, serving until 1952. He then served as county assessor from 1952 to 1958, when he was elected to the US House of Representatives; he would serve from 1959 to 1980 without facing serious opposition. He died in office in Alexandria, Virginia in 1980.